Abstract and subjects
For the first time, a diagnostic for extreme ultraviolet (EUV) spectroscopy was fielded on a sheared-flow-stabilized (SFS) fusion Z-pinch experiment (FuZE-Q). The spectrometer collected time-gated plasma emission spectra in the 5-40 nm wavelength (30-250 eV) range for impurity identification, radiative power studies, and for plasma temperature and density measurements. The implementation of the diagnostic included fast (−10-ns risetime) pulsed high voltage electronics and a multi-stage differential pumping system that allowed the vacuum-coupled spectrometer to collect 3-independently-timed spectra per FuZE-Q shot while also protecting sensitive internal components. Analysis of line emission identified oxygen (0-III, O-IV, O-V, and O-VI), peaking in intensity shortly after maximum current (>500 kA). This work provides a foundation for future high energy spectroscopy experiments on SFS Z-pinch devices.